result of system call

[budgie]

Hi there,

I'm using the system() function to call a program but would like to
get the result of this operation.

system returns an int depending on weather the command was executed
successfully of not.

How can I get a string -- or array of strings with the output of the
camming line application instead?

Thanks

Karl

 

[David B. Held]

[...]
How can I get a string -- or array of strings with the output of
the camming line application instead?

You would need to redirect the output of the application.
On many systems, there is a fork() function, or something
similar. In this way, your program can call another process
and control several features, such as the I/O.

Dave

 

[Moonlit]

Hi,

Use
popen( "command", "r" );

then read from the returned descriptor. This method is one way either you
read or write, but it is less code than fork.

Regards, Ron AF Greve.

 

[WW]

Hi,

Use
popen( "command", "r" );

then read from the returned descriptor. This method is one way either
you read or write, but it is less code than fork.

Neither popen, nor fork is a standard C or C++ function. They are POSIX
functions, off-topic here. But that is not the point: since they aren't C
and C++ functions it is nice to mention that fact once you post them into a
C++ newsgroup.

 

[klaas]

Hi there,

I'm using the system() function to call a program but would like to
get the result of this operation.

system returns an int depending on weather the command was executed
successfully of not.

How can I get a string -- or array of strings with the output of the
camming line application instead?

Thanks

Karl

maybe
char * d << system("yukk.exe");
might work
but then it probably will not
but you could make it work with:
my_string x << system("yukk.exe");
but probably not, because standard out is standard out

 

[Ron Natalie]

maybe
char * d << system("yukk.exe");
might work
but then it probably will not
but you could make it work with:
my_string x << system("yukk.exe");
but probably not, because standard out is standard out

System doesn't return strings. System returns a single int.
If the argument is other than a null pointer, the value of this
single int is implementation-defined.

It's not a bunch of strings reflecting the output of the command
invoked in any case.

You will have to do this in a system dependent fashion. If you
are on a UNIX/POSIX system, try popen.